Emulating sun reflection on fake ocean
You could use a material similar to the following :



Here the 'sun' is an emissive sphere and a Bump node has been used on the plane to give the appearance of waves (from a Noise texture), using Fresnel to blend between Diffuse and Glossy. Be sure to keep a bit of Roughness to the Glossy shader (that's what causes the reflection to 'bleed' towards the viewer) and adjust the Diffuse shader to give a hint of color.